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| 1 | +package; |
| 2 | + |
| 3 | +/** |
| 4 | + * A Haxe implementation of various averages or means |
| 5 | + * |
| 6 | + * @author Tyler Pond AKA Wayfur |
| 7 | + */ |
| 8 | +class Average |
| 9 | +{ |
| 10 | + public function new():Void{} |
| 11 | + |
| 12 | + public function arithmeticMean(arr:Array<Float>):Float |
| 13 | + { |
| 14 | + var sum:Float = 0; |
| 15 | + for (num in arr) |
| 16 | + { |
| 17 | + sum += num; |
| 18 | + } |
| 19 | + return sum / arr.length; |
| 20 | + } |
| 21 | + |
| 22 | + public function geometricMean(arr:Array<Float>):Float |
| 23 | + { |
| 24 | + var product:Float = 1; |
| 25 | + for (num in arr) |
| 26 | + { |
| 27 | + product *= num; |
| 28 | + } |
| 29 | + return Math.pow(product, (1 / arr.length)); |
| 30 | + } |
| 31 | + |
| 32 | + public function harmonicMean(arr:Array<Float>):Float |
| 33 | + { |
| 34 | + var sum:Float = 0; |
| 35 | + for (num in arr) |
| 36 | + { |
| 37 | + sum += (1 / num); |
| 38 | + } |
| 39 | + return arr.length / sum; |
| 40 | + } |
| 41 | + |
| 42 | + public function quadraticMean(arr:Array<Float>):Float |
| 43 | + { |
| 44 | + var sum:Float = 0; |
| 45 | + for (num in arr) |
| 46 | + { |
| 47 | + sum += num * num; |
| 48 | + } |
| 49 | + return Math.sqrt(sum / arr.length); |
| 50 | + } |
| 51 | + |
| 52 | + public function powerMean(arr:Array<Float>, power:Float):Float |
| 53 | + { |
| 54 | + var sum:Float = 0; |
| 55 | + for (num in arr) |
| 56 | + { |
| 57 | + sum += Math.pow(num, power); |
| 58 | + } |
| 59 | + return Math.pow(((1 / arr.length) * sum), (1 / power)); |
| 60 | + } |
| 61 | + |
| 62 | + public function weightedMean(arr:Array<Float>, weights:Array<Float>):Float |
| 63 | + { |
| 64 | + if (arr.length != weights.length) |
| 65 | + { |
| 66 | + throw "values and weights lengths are not equal"; |
| 67 | + } |
| 68 | + else |
| 69 | + { |
| 70 | + var weighted:Float = 0; |
| 71 | + var sum:Float = 0; |
| 72 | + for (i in 0...arr.length) |
| 73 | + { |
| 74 | + weighted += arr[i] * weights[i]; |
| 75 | + sum += weights[i]; |
| 76 | + } |
| 77 | + return weighted / sum; |
| 78 | + } |
| 79 | + } |
| 80 | + |
| 81 | + public function midrangeMean(arr:Array<Float>):Float |
| 82 | + { |
| 83 | + var min:Float = 0; |
| 84 | + var max:Float = 0; |
| 85 | + for (num in arr) |
| 86 | + { |
| 87 | + if (num > max) |
| 88 | + max = num; |
| 89 | + } |
| 90 | + min = max; |
| 91 | + for (num in arr) |
| 92 | + { |
| 93 | + if (num < min) |
| 94 | + min = num; |
| 95 | + } |
| 96 | + return 0.5 * (max + min); |
| 97 | + } |
| 98 | + |
| 99 | + public function energaticMean(arr:Array<Float>):Float |
| 100 | + { |
| 101 | + var sum:Float = 0; |
| 102 | + for (num in arr) |
| 103 | + { |
| 104 | + sum += Math.pow(10, num / 10); |
| 105 | + } |
| 106 | + return 10 * log(1 / arr.length * sum, 10); |
| 107 | + } |
| 108 | + |
| 109 | + private function log(a:Float, b:Float):Float |
| 110 | + { |
| 111 | + return Math.log(a) / Math.log(b); |
| 112 | + } |
| 113 | +} |
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